package com.kx.kxpicture.config;

import lombok.extern.slf4j.Slf4j;
import org.apache.catalina.connector.InputBuffer;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;

/**
 * 包装请求，使HttpServletRequest中的body流可以重复读取
 *
 * @author kuangxin
 * date 2025/9/13
 */
@Slf4j
public class RequestWrapper extends HttpServletRequestWrapper {
    private final String body;

    public RequestWrapper(HttpServletRequest request) {
        super(request);
        StringBuilder stringBuilder = new StringBuilder();
        try (InputStream inputStream = request.getInputStream();
             BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, Charset.defaultCharset()))) {
                 char[] charBuffer = new char[128];
                 int bytesRead = -1;
            while((bytesRead =bufferedReader.read(charBuffer))>0)

                 {
                     stringBuilder.append(charBuffer, 0, bytesRead);
                 }
             } catch(IOException ignored) {
        }
        body = stringBuilder.toString();
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
        return new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {
            }

            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }
        };
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    public String getBody() {
        return this.body;
    }
}